<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8" />
	<style type="text/css">
				.rgba{
					background-color: rgba(0,0,0,0);
					height: 100px;
				}
			</style>
</head>
<body>
<div class="rgba">
	<h1 ><font size="30" color="red">测试</font></h1>
</div>
</body>
</html>